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TST: validation tests for resample/groupby preservation #12314

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TST: validation tests for resample/groupby preservation #12314

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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v0.18.0.txt
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Expand Up @@ -574,7 +574,7 @@ other anchored offsets like ``MonthBegin`` and ``YearBegin``.
Resample API
^^^^^^^^^^^^

Like the change in the window functions API :ref:`above <whatsnew_0180.enhancements.moments>`, ``.resample(...)`` is changing to have a more groupby-like API. (:issue:`11732`, :issue:`12702`).
Like the change in the window functions API :ref:`above <whatsnew_0180.enhancements.moments>`, ``.resample(...)`` is changing to have a more groupby-like API. (:issue:`11732`, :issue:`12702`, :issue:`12202`).

.. ipython:: python

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18 changes: 18 additions & 0 deletions pandas/tseries/tests/test_resample.py
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Expand Up @@ -1220,6 +1220,24 @@ def test_resample_empty(self):
# (ex: doing mean with dtype of np.object)
pass

def test_resample_dtype_preservation(self):

# GH 12202
# validation tests for dtype preservation

df = DataFrame({'date': pd.date_range(start='2016-01-01',
periods=4, freq='W'),
'group': [1, 1, 2, 2],
'val': Series([5, 6, 7, 8],
dtype='int32')}
).set_index('date')

result = df.resample('1D').ffill()
self.assertEqual(result.val.dtype, np.int32)

result = df.groupby('group').resample('1D').ffill()
self.assertEqual(result.val.dtype, np.int32)

def test_weekly_resample_buglet(self):
# #1327
rng = date_range('1/1/2000', freq='B', periods=20)
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